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采用高温结晶法处理硼矿石硫酸法制硼酸后的母液,进行硫酸镁和硼酸的分离。结晶实验在FXY-0.5A 高压釜中进行。在180℃温度下,MgSO4-H3BO3-H2O 体系结晶生成固相MgSO4·H2O。研究了硫酸镁浓度、硼酸浓度、结晶时间对MgSO4·H2O 结晶产率的影响,最后确定母液中MgSO4 结晶生成固相MgSO4·H2O 的最佳工艺条件为:溶液中硫酸镁的浓度为25% —28% ,硼酸的浓度小于4% ,结晶时间4h,结晶温度180℃,一水硫酸镁产率为57.6% 。
High temperature crystallization method boric acid sulfuric acid boric acid after the mother liquor, magnesium sulfate and boric acid separation. Crystallization experiments were performed in a FXY-0.5A autoclave. At 180 ℃, MgSO4-H3BO3-H2O system crystallizes into solid MgSO4 · H2O. The effects of magnesium sulfate concentration, boric acid concentration and crystallization time on the crystallization yield of MgSO4 · H2O were studied. The optimum conditions for the crystallization of MgSO4 · H2O from the mother liquor were determined as follows: the concentration of magnesium sulfate in the solution was 25% 28%, the concentration of boric acid is less than 4%, the crystallization time is 4h, the crystallization temperature is 180 ℃ and the yield of magnesium sulfate monohydrate is 57.6%.